If you are working on a security system installation or maintaining an existing access control setup, you know that reliability is everything. The power supply is the heart of the system—if it fails, the cameras, locks, and panels stop working.
One unit that has become a staple in the industry is the Elmdene 7422-SFG-G3F. Known for its robust design and compliance with modern standards, this switched-mode power supply is a workhorse. But if you’ve landed here, you are likely looking for the manual or specific instructions on how to set it up correctly.
In this post, we will cover the key specifications, installation guidelines, and where to find the official manual for the Elmdene 7422-SFG-G3F.
Note: Always disconnect mains power before opening the unit. If you are not a qualified electrician, consult a professional. elmdene 7422-sfg-g3f manual
The Elmdene 7422-SFG-G3F is a sophisticated, switch-mode power supply unit designed primarily for fire alarms, security systems, and access control panels. Elmdene International Ltd, a UK-based manufacturer, is renowned for producing high-integrity power supplies that meet stringent European safety standards.
Model Breakdown:
This unit is designed to convert a 230V AC mains supply into a regulated 13.8V DC output, suitable for powering intrusion detection systems (IDS), CCTV cameras, and electronic locks. If you are working on a security system
The manual opens with a critical specifications table. Before installation, verify these against your system requirements:
| Parameter | Value | | :--- | :--- | | Input Voltage | 230V AC ±10% (50/60 Hz) | | Output Voltage (Nominal) | 13.8V DC (float charge) | | Output Current (Continuous) | 3A | | Current (Intermittent/Peak) | 4.5A (for 5 minutes, door strikes) | | Ripple & Noise | < 50mV peak-to-peak | | Battery Charging Capability | 7Ah (12V lead-acid or gel) – Up to 12Ah with derating | | Operating Temperature | -10°C to +50°C | | Enclosure Type | IP30 (Indoor use only) | | Fuse Ratings | Primary: T1.6A L (slow blow); Output: Glass 3.15A; Battery: Glass 3.15A |
Expert note from the manual: Do not exceed a 7Ah battery if the unit is mounted in a high ambient temperature above 40°C, as this reduces battery life and risks thermal shutdown. Note: Always disconnect mains power before opening the unit
The manual provides a detailed mechanical diagram. Here’s what you’ll find inside the steel enclosure:
The 7422-SFG-G3F has four LEDs:
| LED | Colour | Function | Indication | |-----|--------|----------|-------------| | PWR | Green | Power status | Steady = normal; Off = no power; Flash = internal fault | | IN | Yellow | Input status | Steady = input active; Off = inactive; Flash = EOL resistor mismatch | | OUT | Red | Relay output status | Steady = relay energised (NO-COM closed); Off = relaxed | | FLT | Orange | Fault | Steady = wiring fault (short/open on input); Flash = power supply out of range |
| Symptom | Possible Cause | Action | |---------|----------------|--------| | PWR LED off | No 24V DC | Check external power supply and fuse | | FLT LED steady | Input wiring open or short | Check continuity of zone wiring. Verify EOL resistor value (typically 3k3 to 10k, check panel spec) | | Output not energising when input active | SW1-1 set incorrectly | If using dry contact, ensure SW1-1 = OFF. If using 24V triggered, set SW1-1 = ON | | Intermittent operation | Loose connection or supply ripple | Tighten terminals. Use regulated PSU | | Unit latches but won’t reset | SW1-2 = ON by design | Cycle power or apply reset pulse as described | | OUT LED flashes rapidly | Overload on relay output | Reduce load current below 2A. Add flyback diode for inductive loads |